What is Common Locale Data Repository (CLDR) in Java 9?

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There are four different sources of locale data identified using the following keywords:

• CLDR: By the Unicode Common Locale Data Repository (CLDR) project.
• HOST: The current user’s customization of the underlying operating system settings. Depending on the operating system, formats such as date, time, numeric, and currency are supported.
• SPI: Locale-sensitive service implemented in the installed SPI provider.
• COMPAT (JRE): Locale data compatible with versions prior to Java 9. JRE can still be used as a value, but is deprecated and will be removed in the future.

In Java 8 and earlier versions, JRE is the default locale data. Java 9 sets CLDR to the highest priority by default. We use the java.locale.providers system properties to select the locale data sources in order of preference. If a provider fails to request locale data, the next provider can be processed.

<strong>java.locale.providers=COMPAT,CLDR,HOST,SPI</strong>

If we don’t set this property, the default behavior is:

<strong>java.locale.providers=CLDR,COMPAT,SPI
</strong>

For Compatible with Java 8, keep COMPAT before CLDR.

<strong>java.locale.providers=COMPAT,CLDR</strong>

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